I cant do it anymore!

My partner is really stressing me out lately! He hardly helps out with our 10 week old daughter. He gets up with her in the morning so I can sleep (I do all the night feeds) but as soon as I'm up around half 11 he's out the door to his friends house to get high and play Xbox where he stays there all day coming home anytime between 6-9pm I feel like a single mother and honestly feel like just telling him to stay with his friend permanently. I'm honestly at the end of my rope